Allowance for Loan Losses - Risk Ratings by Segment (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 |
In Thousands, unless otherwise specified |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | $418,436 | $398,198 | $376,939 |
Commercial real estate | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 242,021 | 242,311 | 240,187 |
Commercial construction | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 34,683 | 30,932 | 21,686 |
Commercial other | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 115,455 | 104,531 | 97,276 |
Municipal | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 26,277 | 20,424 | 17,790 |
1 Strong | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 355 | 342 | 276 |
1 Strong | Commercial real estate | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 11 | 12 | 15 |
1 Strong | Commercial construction | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0 |
1 Strong | Commercial other | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 344 | 330 | 261 |
1 Strong | Municipal | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0 |
2 Above Average | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 45,334 | 39,438 | 33,444 |
2 Above Average | Commercial real estate | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 11,599 | 12,668 | 9,287 |
2 Above Average | Commercial construction | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 766 | 771 | 773 |
2 Above Average | Commercial other | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 8,282 | 7,210 | 7,458 |
2 Above Average | Municipal | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 24,687 | 18,789 | 15,926 |
3 Satisfactory | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 81,403 | 78,125 | 64,726 |
3 Satisfactory | Commercial real estate | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 52,828 | 50,275 | 44,918 |
3 Satisfactory | Commercial construction | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 2,227 | 1,983 | 1,080 |
3 Satisfactory | Commercial other | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 24,758 | 24,232 | 16,864 |
3 Satisfactory | Municipal | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 1,590 | 1,635 | 1,864 |
4 Average | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 189,467 | 176,959 | 165,196 |
4 Average | Commercial real estate | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 108,480 | 108,719 | 102,361 |
4 Average | Commercial construction | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 25,867 | 23,345 | 16,388 |
4 Average | Commercial other | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 55,120 | 44,895 | 46,447 |
4 Average | Municipal | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0 |
5 Watch | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 57,025 | 56,712 | 43,907 |
5 Watch | Commercial real estate | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 36,816 | 36,974 | 33,079 |
5 Watch | Commercial construction | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 2,567 | 1,567 | 0 |
5 Watch | Commercial other | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 17,642 | 18,171 | 10,828 |
5 Watch | Municipal | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0 |
6 OAEM | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 13,848 | 14,335 | 33,502 |
6 OAEM | Commercial real estate | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 9,670 | 9,846 | 26,951 |
6 OAEM | Commercial construction | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 2,509 | 2,519 | 2,668 |
6 OAEM | Commercial other | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 1,669 | 1,970 | 3,883 |
6 OAEM | Municipal | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0 |
7 Substandard | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 31,004 | 32,287 | 35,848 |
7 Substandard | Commercial real estate | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 22,617 | 23,817 | 23,576 |
7 Substandard | Commercial construction | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 747 | 747 | 777 |
7 Substandard | Commercial other | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 7,640 | 7,723 | 11,495 |
7 Substandard | Municipal | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0 |
8 Doubtful | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 40 |
8 Doubtful | Commercial real estate | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0 |
8 Doubtful | Commercial construction | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0 |
8 Doubtful | Commercial other | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 40 |
8 Doubtful | Municipal | | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | | |
Commercial and municipal risk-rated loans receivable | $0 | $0 | $0 |